*Re-posting to expand the info...
Hey, thank you for sharing your ship with us!
I will try do post some hints and tips to improve your technique. Who knows, you may be our next StarLord_Luke =)
1) Outside:
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+ Overall, the ships is interesting. You found a very cool shell shape. I really like it.
+ I think it would look better if you could find a way to hid the thruster blocks with an nozzle, people here usually use ice blocks with colored lights to do it. IF wanted an alien looking, completely hiding thrusters could achieve that.
+ You need to lean how to do rail doors. replacing your plex with them could really improve your technique. If you did had some kind of space constrain (which is not the case on this ship) you could still use plex, but integrate with slabs, blast doors, force-fields and glass door blocks to achieve an interesting "door shape".
+ I think the color pallet you choose combined with the details you did in black and white suggests an derelict ship. This is an good niche you could explore.
+ If you wanted your ship to look more alive, you could add some motherboard blocks, struts, and other decorative blocks in some sections. Varying the armor type and adding some slabbing can also help to add variety.
+ Using wedges and slabs could be used to create vents and aerodynamic (I know its space, but you got the idea) sections which turns the ship more interesting. Behind the vent grills and crystal could show that there's engine activity.
2) Inside:
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+ The game char have ~2 blocks height so if you want to make an human liveable/believable ship, you need to place the bridge computers and systems 1 block higher.
+ There's no chairs, tables or stations. You could add some using wedges as chairs. People usually go for ingot wedges, for those plastic or metalic chairs or maybe brown advanced armor, for leather-like effect. An Inverted black basic wedge, for example could be an small table. But your imagination it the only constrain here.
+ Try adding mainframes using the deco computers. The weapon tubes could be used to simulate ship conduits, you dont need to connect weapon computers to them for this use.
+ You could also use terminals to display some garbage text, simulating an alien language or if you want an human ship, copy some random lore from the internet on them. You don't necessarily need to use logic on them to attain some cool effects. I use teleporter pads as radar screens.
+ There's a problem with the side corridors that go from the docking bay to the bridge. They have a 90 degrees turn in one point where they loose their shape and becames excessively tight. Try to maintain the proportions when you do these connection points.
+ You could make your corridors a lot more interesting using columns, computer panels and slabs. Also need some internal color variation, like a continuous stripe "painted" on the walls, using and standard armor block or a motherboard block, for example.
3) Systems:
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+ Your reactor is too small. You could use one a lot bigger if you relocate some of your stabilizers.
+ Also, you have a lot of empty space, try to fill them with shield capacitors (remember to build them in groups, you could have a max of 20).
+ You have am abysmally low thrust / mass ratio. 0.1 ( !!! ). you could use you empty space to insert thruster blocks.
+ Regarding the ship classification, this hull size / reactor size could indicate an light cruiser or even a frigate. This is debatable tho, since theres no real starmade standards for that. I would call a cruiser (a standard one) something around 250m and a 1 million e/sec reactor.
Have fun!